Dry cell and depolarizer therefor



Sept. 28 1926.

G. W. HEISE DRY CELL AND DEPOLARIZER THEREFOR Filed June 1'7, 1924 god 02141 04,

Patented Sept. 28, 1926.

UNITED STATES 1,601,415 PATENT OFFICE.

GEORGE W. HEISE, OEIBAYSIDE, NEW YORK, ASSIGNOR TO NATIONAL CARBON COM- PANY, INC., A CORPORATION OF NEW YORK.

DRY CELLAND DEPOLARIZER THEREFOR.

Application filed .Tune 17, 1924. Serial NO. 720,702.

This invention relates to improvements in the Wrapping of depolarizing bodies for gal-.

vanic cells, particularly .dry cells comprising a container electrode. In general, the invention comprises the utilization of a portion of the Wrapping as a centering means.

It is well recognized that the depolarizing body should be centrally positioned with respect to the walls of the container electrode. If this is not the case serious reduction of shelf life and service capacitymay result. For example, off-center mix bobbins in dry cells are liable to cause irregularity in zinc corrosion and other defects thatmay injure the cells. Various means have been proposed to avoid this difliculty. Ordinarily these comprise a member spacing the bottom of the bobbin from the container, one or more rubber bands about the bobbin, or the like.

- In accordance with a preferred embodiment of the present invention, the desired result is attained by turning back a portion of the fabric wrapping of the bobbin to form a centering ring about its base. There is produced in this way a simplified construction having positive advantages more fully referred to hereinafter.

Reference is to be made to the accompanying drawing in which:

b Fig. 1 is a side elevation of a wrapped bob- Fig. 2 is a similar view, showing the wrapping turned back on the bobbin;

Fig. 3 is a vertical section through a cell containing the improved bobbin; and

Figs. 4 and 5 are side elevations of bobbins having a modified form of wrapping.

In Figs. 1 to 3 of the drawing reference numeral 1 denotes a bobbin having a wrapping 2 of porous material. This is illustrated as a fabric of the type of cheesecloth, but other materials may be used. The wrapping may be secured by a cord 3. Adhesives or other securing means are also applicable.

The wrapping has a portion 4 extending below the bobbin and adapted to be turned back, as shown in Figs. 2 and 3. The length of the portion 4 may be varied but that illustrated gives good results with bobbins for dry cells of the flashlight ty e.

The bobbin may be assem led in a cell, as 5, Fig. 3, in any suitable manner. For example, after the wrapping is turned up as described, the bobbin may be dipped in electrolyte paste. It is advantageous to allow enlargement a jacent to the base of the ob- 0 ect the paste to set before inserting the bobbin in the cell. When thisis done the paste solidifies in a ring adjacent the bottom of the bobbin and cooperates with the centering portion of the wrapper.

The formation of a paste ring is by no 'means necessary, however, and the bobbin may be immersed in paste contained in the electrode or otherwise suitably assem- Aside from its centering action, the turned back portion of the wrapper is further advantageous in that it may take the place of the usual insulating washer placed in the bottom of the cell. The double fold of cloth or the like at the base of the bobbin is ample to revent contact of the mix and zinc. Electrolytic action may take place through the cloth and the effective zinc area of the cell is therefore materially larger than in cells of the same size having the zinc bottom covered with an insulating member. The resulting increase in service capacity isespecially important when the cells are to be subjected to relatively heavy current drain, for example in flashlight usage.

The invention resides broadly in the utilization of a portion of the wrapper as centering means. While the embodiment shown in Figs. 1 to 3 is generally preferred, other forms are suitable. For example, in Fig. 4 is illustrated a wrapper cut to provide streamers which may be turned back u on the bobbin to form centering tongues 6. nother illustrative form is shown in Fig. 5, in which elongated portions of the wrapper are wound about the bobbin to form a centering band 7. Separate pieces of cloth or the like may of course beused in the formation of the centering means, but it is ordinarily most convenient to utilize a portion of the main Wrapping for this purpose. i

The improved wrapper facilitates manufacture and is a material aid in securing the uniform production of cells having excellent service and shelf life characteristics.

1 claim:

- 1. A bod of depolarizer having a wrap- I ing rovi ed with a portion adapted to proeyond' the peripheral suriace of the wrapped body so as to center it in a container. 2. A body of depolarizer having a fabric wrapping com rising a portion formin an a fabric wrappingextending at the bottom" Vand adapted tobe turned back upon the bobbin to form a centering band.

Y 5. A dry .celldepolarizing bobbinhaving a wrapping provided with an enlarged portion adapted to center the bobbin in a container, and paste adherent to the'wrapped bobbln.

6. A galvanic cell comprising a container electrode, a body of wrapped depolarizing mi; therein, a. portion of t e wrapping being adapted to project be 0nd the peripheral surface of the wrapper body so as to center it in the cell.

7. A dry cell comprising a zinc cup, a mix bobbin therein, and a wrapping on the bob= bin comprising an enlar ed portion adapted to center the bobbin in t e cup,

8. A dry cell comprising a zinc cup, a mix bobbin therein, a wrapping on the bobbin comprising an enlarged portion adapted to portion spacingthe bobbin from the bottom of the cup but permitting electrolytic actionthereon.

In testimony whereof, I afiix mysi ature.

' GEORGE W. H ISE.

center the bobbin in the cup, said enlarged 

